Metamath Proof Explorer
Table of Contents - 21.20.6.1. Complements on class abstractions of ordered pairs and binary relations
- bj-nfald
- bj-nfexd
- cgsex2gd
- copsex2gd
- copsex2d
- copsex2b
- opelopabd
- opelopabb
- opelopabbv
- bj-opelrelex
- bj-opelresdm
- bj-brresdm
- brabd0
- brabd
- bj-brab2a1